4.5 Article

Short timescale variability in large-amplitude internal waves on the western Portuguese shelf

期刊

CONTINENTAL SHELF RESEARCH
卷 246, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2022.104812

关键词

Internal Solitary Waves; predictability; Mesoscale Variability; Synthetic Aperture Radar; Portugal

资金

  1. EU
  2. FCT/MCT national funds [LISBOA-01-0145-FEDER-031265]
  3. Fundacao para a Ciencia e Tecnologia (FCT) [UIDB/04423/2020]
  4. FCT - Portuguese Foundation for Science and Technology [UIDP/04423/2020, UIDP/50017/2020 + UIDB/50017/2020]
  5. FCT/MCTES
  6. [UIDB/04683/2020]

向作者/读者索取更多资源

This study assesses the variability of coastal internal wave systems off the western Portuguese shelf using satellite imagery and temperature records. The data shows significant variability on timescales of a few days. A regional ocean circulation model and linear theory are used to analyze the impact of mesoscale variability on the observed internal wave patterns.
Timescales in the ocean can range from the transient turbulence to the long-term climate scales. Quantifying its changes involves establishing meaningful background states, but that can be challenging if an extensive array of wave phenomena is masking the ocean's variability. Internal Waves (IWs) are a fundamental part of these wave phenomena, which are now widely acknowledged as major contributors in ocean dynamics. In this study we use satellite imagery from Synthetic Aperture Radars (SAR) and moored temperature records to assess the variability scales and magnitudes of coastal IW systems propagating onshore off the western Portuguese shelf. The data shows significant variability in timescales of just a few days, and hence within the waves' typical propagation lifespan. A regional ocean circulation model is used together with linear theory to assess how mesoscale variability is contributing to the observed variability patterns observed in the IWs in the SAR and in situ data. Ac-cording to linear theory, the IW variability is mostly owing to variable mesoscale currents, which off the Portuguese coast typically result from geostrophic flows, eddies and upwelling dynamics. IW variability owing to changes in stratification is found to amount to about half of that in background flows, but their effect can go unnoticed within the largest contributions from mesoscale currents. One extreme event is highlighted in which IWs from consecutive tidal cycles could possibly decouple from (i.e. not traceable back to) their originating tides in just a few days and hence within their typical lifespans.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据